Explanation:
Atomic number of nickel is 28 and its electronic distribution is 2, 8, 8, 2, 8. Therefore, in the inner/core electrons there are 18 electrons.
Atomic number of chromium is 24 and its electronic configuration is . Whereas atomic number of manganese is 25 and its electronic configuration is
.
Hence, the statement both chromium atom and the manganese atom have half-filled d sub-shells, is true.
Atomic number of Vanadium is 23 and its electronic configuration is . Atomic number of nickel is 28 and its electronic configuration is
.
So, there are three unpaired electrons in a Vanadium atom and in nickel atom there are 2 unpaired electrons.
Hence, the statement vanadium atom has fewer unpaired electrons than the nickel atom, is false.
Atomic number of titanium is 22 and its electronic configuration is . Atomic number of zinc is 30 and its electronic configuration is
.
There are no unpaired electrons in a zinc atom. Hence, the statement titanium atom has more unpaired electrons than the zinc atom, is true.
Atomic number of iron is 26 and its electronic configuration is . Since, 4s is the outermost shell so, in iron atom there are 2 valence electrons.
Hence, the statement iron atom has 8 valence electrons, is not true.
Thus, we can conclude that false statements below concerning period 4 transition elements are as follows.
- The vanadium atom has fewer unpaired electrons than the nickel atom.
- The iron atom has 8 valence electrons.